<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <style>
        article{
            display: flex;
            width: 400px;
            height: 400px;
            background-color: crimson;
            border:solid 5px black;
            /* flex-direction: column; */
            justify-content:center;
            /* align-items: flex-end; */
            /* align-content:space-around; */
            flex-wrap: wrap;
        }
        article>div{
            width: 100px;
            height: 100px;
            background: #fff;
            border:solid 2px #398398;
            box-sizing: border-box;
        }
    </style>
    <article>
       <div>1</div>
       <div>2</div>
       <div>3</div>
       <!-- <div>4</div>
       <div>5</div>
       <div>6</div>
       <div>7</div> -->
    </article>
</body>
</html>